Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c524897c026274f…

MALICIOUS

PDF

216.1 KB Created: 2021-03-24 08:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7973320fd19e2e2bc961da6e0718c633 SHA-1: 91e9480012a389d547cbabe6c7d27589127ad7fb SHA-256: 9c524897c026274f3c70331661594d03ebf2f7515bd3c2aa1e9052a88dca1173
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded URI pointing to a suspicious domain, 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body appears to be obfuscated or corrupted, but the presence of external URLs and the overall detection strongly suggest a malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kuzutuzo.ru/award?keyword=adolescent+friendly+health+services+pdf
    • http://trysoda.club/38785285926zceee.pdf
    • http://dayzcommunity.info/mia_marin_wikipediah1lbc.pdf
    • http://oneitstore.pro/75533333377hppd1.pdf
    • https://bigimegena.weebly.com/uploads/1/3/1/4/131438437/1895928.pdf
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5fd76beced6b7.pdf
    • https://jiromozuno.weebly.com/uploads/1/3/5/3/135387519/3182557.pdf
    • https://cdn-cms.f-static.net/uploads/4473890/normal_5fda6618a03ac.pdf
    • https://tudadakamoziv.weebly.com/uploads/1/3/4/5/134596668/cd41bb2dbb.pdf
    • https://static.s123-cdn-static.com/uploads/4453741/normal_5fdd8d1579672.pdf
    • https://cdn-cms.f-static.net/uploads/4477162/normal_6022c1fc10ca6.pdf
    • https://sugopubix.weebly.com/uploads/1/3/1/6/131637077/6713419.pdf
    • https://cdn-cms.f-static.net/uploads/4405409/normal_600d192ee641e.pdf
    • https://tugesarafexo.weebly.com/uploads/1/3/5/3/135319839/e50b6b.pdf
    • http://xevedudox.sportsontheweb.net/president_aquino_sainthood_postponed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_d834aa7ccb0d422cac9e4620c8ea192b.pdf?index=true
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_e2a21e2f73ad496cacf5d43d0c8a9869.pdf?index=true
    • http://tasewegevatale.rf.gd/struts_framework.pdf
    • http://pekomuvave.myartsonline.com/simbolos_griegos_matematicos.pdf
    • http://mimodiko.epizy.com/giweli.pdf
    • http://xolavozezimodan.onlinewebshop.net/agile_principles_and_practices_in_c.pdf
    • http://somifinufax.rf.gd/english_legal_terminology_book.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00031ac2.bin
b3fdd61a1be7670bd2ee537d103ccaa4763e30b0df7998f9c96304d708924578
pdf-font-stream PDF embedded font (sfnt) at offset 0x31AC2 5392 bytes
font_01_sfnt_off00032d29.bin
83ae1a9474a80265e34a87640d5ecc08930aacc02428e1961a62297f1082f32c
pdf-font-stream PDF embedded font (sfnt) at offset 0x32D29 10876 bytes